[Python-Dev] Dataclasses, frozen and __post_init__

[Raymond Hettinger]

> On Feb 20, 2018, at 2:38 PM, Guido van Rossum <guido at python.org> wrote:
> 
> But then the class would also inherit a bunch of misfeatures from tuple (like being indexable and having a length). It would be nicer if it used __slots__ instead.


FWIW, George Sakkis made a tool like this about nine years ago.  https://code.activestate.com/recipes/576555-records  It would need to be modernized to include default arguments, types annotations and whatnot, but otherwise it has great performance and low API complexity.

> (Also, the problem with __slots__ is the same as the problem with inheriting from tuple, and it should just be solved right, somehow.)

Perhaps a new variant of __init_subclass__ would work.



Raymond